Yes, I have considered KMS and AD based activation, and that is something I will likely do in the future. However, in this current scenario, I used VAMT 3.0 to proxy activate the device in question and it now shows Licensed and Genuine
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You need to use the Volume activation Management Tool (VMAT) it lets you see all your license infrastructure
or you could use slmgr and find the settings to remove the key.
I personally like VMAT as it is GUI and lets you see all the keys installed in yoru environment.
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Login and get the MAK key from the licensing center. You can use the older MAK if you want, but I'd probably just use the new MAK. I believe the keys will be tied to your License Number, so you should be able to differentiate if that is what you are trying to do.

In the Volume Licensing Service Center, you should be able to get keys and download the media for the previous version. In your case, the 2013 version shuold have N1 downgrade rights for 2010, and provide the keys and media necessary. If not, contact the Microsoft Product Activation Center and they can fix this. And, you can always contact your reseller and they should be able to straighten this out as well.

Use the 2013 MAK key on the 2010 media? It was not working, that is what sent me down this rabbit hole. So all the older posts just say, use the key in the vl center? I have several 2010's but they are all in use from previous installs. Please be specific on where the new key you speak of is located. The one that appears when I expand Office 2013 is the key I have been trying. I am trying to avoid having to download 2013, installing and testing the key on a pc only to uninstall after; all to ensure this key isn't jacked in some way.

After you log into the VLSC click on "Downloads and Keys", then "Office" (under Filters on the left side), then click "Key" on the line that has Office Professional Plus 2010. The list will show how many activations are left for a given MAK. You'll also want to make sure you're grabbing a MAK key rather than KMS, since both will be listed.